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Hyundai G4EK specs: 1.5L (91.2 ci) 4-cylinder, 75.5 x 83.5 mm (2.9724 x 3.2874 in) bore and stroke, 10:1 compression. Rated 92 hp. Rod ratio and piston speed.
The Hyundai G4EK is undersquare — the 3.2874" stroke exceeds the 2.9724" bore by 9.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2874" stroke does not reach 4,000 ft/min of mean piston speed until about 7,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.8 ci (374 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 3 engines in the Alpha family, the smallest at 91.2 ci. Factory fitments include the Scoupe, Accent, Elantra.
| Displacement | 91.2 ci / 1.5 L |
|---|---|
| Bore | 2.9724" |
| Stroke | 3.2874" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.904 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 92 hp |
| Bore/stroke character | 0.904 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,287 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.8 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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